JP2009091962A - Centrifugal fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal fan whose external size can be reduced while securing appropriate mechanical strength of a casing. <P>SOLUTION: A plurality of attachment parts 4 for attaching the centrifugal fan 10 to the casing 8 are provided on a surface 321 facing to upside of a center axis 5 direction of a cover 32 composing the casing 3. A first and a second locking parts 322, 323 are provided with avoiding positions of which distance from each attachment part 4 on an outside surface of the cover 32 are the shortest for fixing the cover 32 on a casing main body 31. The cover 32 and the plurality of attachment parts 4 are formed as a continuous single resin member by injection molding. Weld is formed with avoiding sections where the attachment parts 4 and the locking parts 322, 323 on which load tends to be applied in the resin member composing the cover 32 and the plurality of the attachment parts 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a centrifugal fan.

  There are two types of small blower fans. One is an axial fan and the other is a centrifugal fan. As a method of proper use, there is a tendency that an axial fan is adopted in a low static pressure region and a centrifugal fan is adopted in a high static pressure region.

  When the blower fan is attached to a casing (a member to be attached) to be blown or exhausted, it is necessary to attach the blower so that air does not leak from the exhaust port or the intake port of the blower fan. In particular, in a centrifugal fan used in a high static pressure region, air leakage from the exhaust port or the intake port greatly affects the air flow characteristics.

Conventionally, when a blower fan is attached to a housing, it is attached using another member such as a bolt. However, in the configuration in which the mounting is performed using bolts or the like, it is necessary to form a mounting hole for inserting a bolt on the outside of the air flow path of the blower fan, so that the outer size of the blower fan becomes large. Moreover, in order to attach a ventilation fan to a housing | casing using a volt | bolt, the driver for turning a volt | bolt and a volt | bolt is needed. Patent Document 1 discloses a configuration in which a mounting hole is formed in an outer portion of a casing.
JP 2006-114608 A

  Accordingly, a first problem to be solved by the present invention is to provide a centrifugal fan that can reduce the outer size of the centrifugal fan while ensuring appropriate mechanical strength of the casing.

  A second problem to be solved by the present invention is to provide a centrifugal fan that can be attached without using a special fixture such as a bolt.

  In order to solve the above-mentioned problems, according to the invention of claim 1, the impeller is a centrifugal fan that sucks air in the direction of the central axis by rotating about the central axis and exhausts it outward in the radial direction. And a motor unit that rotates the impeller, and supports the motor unit, an air inlet is formed on the upper side in the central axis direction, an exhaust port is formed in the radial direction, and air generated by the impeller A casing that forms a flow path of the flow, and a plurality of attachment portions that are provided on a surface of the casing facing the upper side in the central axis direction, and for attaching the centrifugal fan to a member to be attached. A casing body having a base portion for supporting the motor portion, a side wall portion in which the exhaust port is formed and surrounding the impeller from the radially outer side, and the casing It is formed as a separate member from the main body, has the surface on which the plurality of mounting portions are provided, faces the base portion in the central axis direction across the impeller, and is above the casing main body in the central axial direction The casing body has a locked portion formed at the upper end of the side wall portion, and the cover is formed on the radially outer side surface of the cover. A locking portion is provided that engages with the locked portion to fix the cover to the casing body, and the locking portion includes the mounting portions on the outer surface of the cover. It is provided to avoid the part where the distance is the shortest.

  According to a second aspect of the present invention, in the centrifugal fan according to the first aspect of the present invention, the cover includes a cover side wall portion extending from the radially outer edge portion toward the casing body. The side wall portion is combined with the side wall portion to constitute the side wall of the casing, and the cover and the cover side wall portion are continuously formed of a single member.

  According to a third aspect of the present invention, in the centrifugal fan according to the first or second aspect of the present invention, the cover has the intake port, and the plurality of attachment portions are outer peripheral portions of the intake port of the cover. Are spaced apart in the circumferential direction about the central axis.

  According to a fourth aspect of the present invention, in the centrifugal fan according to any one of the first to third aspects, the cover and the plurality of attachment portions are formed as a single resin member continuous by injection molding. ing.

  According to a fifth aspect of the present invention, in the centrifugal fan according to the fourth aspect of the present invention, the weld produced by the injection molding is formed in a portion other than the mounting portion in the resin member.

  According to a sixth aspect of the present invention, in the centrifugal fan according to the fourth or fifth aspect of the present invention, the weld produced by the injection molding is formed at a portion other than the locking portion of the resin member.

  According to a seventh aspect of the present invention, in the centrifugal fan according to any one of the first to sixth aspects, the locking portion is a first portion that engages with the locked portion from the radially inner side. A locking portion and a second locking portion that engages from the radially outer side of the locked portion.

  According to an eighth aspect of the present invention, in the centrifugal fan according to any one of the first to seventh aspects of the present invention, the mounting portion engages with a predetermined part of the member to be mounted, whereby the centrifugal fan is Fix it.

  According to a ninth aspect of the present invention, in the centrifugal fan according to any one of the first to eighth aspects, the mounting portion includes a support portion extending in the central axis direction from the surface of the cover, and the support. A hook portion extending in a circumferential direction around the central axis from the tip of the portion, and a through hole is provided in a portion of the cover that overlaps with the hook portion when viewed from the central axis direction.

  According to a tenth aspect of the present invention, there is provided a centrifugal fan that rotates around a central axis, thereby sucking air in the direction of the central axis and exhausting it radially outward, and rotating the impeller A motor unit to be supported, and an air inlet formed on the upper side in the central axis direction, an exhaust port formed in the radial direction, and a flow path for an air flow generated by the impeller And a plurality of attachment portions for attaching the centrifugal fan to a member to be attached, the casing including the motor portion. A base portion having the surface on which the plurality of attachment portions are provided and the casing body are formed as separate members, the exhaust port is formed, and the impeller is disposed in front. A cover that has a side wall portion that surrounds from the outside in the radial direction, and that is opposed to the base portion and the central axis direction with the impeller interposed therebetween, and is disposed on the upper side in the central axis direction of the base portion. The cover is formed with a locked portion at the lower end of the side wall portion, and the base portion is provided on the radially outer side surface of the base portion, A locking portion for fixing the base portion to the cover by engaging is formed, and the locking portion is a portion where the distance from the mounting portion on the outer surface of the base portion is the shortest. Avoid it.

  According to an eleventh aspect of the present invention, in the centrifugal fan according to the tenth aspect of the present invention, the base portion has the intake port, and the plurality of attachment portions extend along an outer peripheral portion of the intake port of the base portion. And spaced apart in the circumferential direction about the central axis.

  According to a twelfth aspect of the invention, in the centrifugal fan according to the tenth or eleventh aspect of the invention, the base portion and the plurality of attachment portions are formed as a single resin member continuous by injection molding. .

  According to a thirteenth aspect of the present invention, in the centrifugal fan according to the twelfth aspect of the present invention, the weld produced by the injection molding is formed in a portion other than the mounting portion of the resin member.

  According to a fourteenth aspect of the present invention, in the centrifugal fan according to the twelfth or thirteenth aspect of the present invention, a weld generated by the injection molding is formed in a portion other than the locking portion in the resin member.

  According to a fifteenth aspect of the present invention, in the centrifugal fan according to any one of the tenth to fourteenth aspects, the locking portion engages the locked portion from the inside in the radial direction. A locking portion; and a second locking portion that engages with the locked portion from the outside in the radial direction.

  According to a sixteenth aspect of the present invention, in the centrifugal fan according to any one of the tenth to fifteenth aspects of the present invention, the attachment portion engages with a predetermined portion of the member to be attached, whereby the centrifugal fan is Fix it.

  Further, in the invention of claim 17, in the centrifugal fan according to any one of claims 10 to 16, the attachment portion includes a support portion that extends in the central axis direction from the surface of the base portion, and A hook portion extending in a circumferential direction around the central axis from the tip of the support portion, and a through hole is provided in a portion of the base portion overlapping the hook portion when viewed from the central axis direction.

  According to the first aspect of the present invention, the plurality of attachment portions for attaching the centrifugal fan to the member to be attached are provided on the surface facing the upper side in the central axis direction of the cover constituting the casing. Thus, it is not necessary to form a bolt insertion hole on the outside of the air flow path in the centrifugal fan.

  Further, a locking portion for fixing the cover to the casing body is provided so as to avoid a portion where the distance from each mounting portion on the outer side surface of the cover is the shortest. Therefore, it is possible to prevent the mechanical strength of the portion where the attachment portion and the engagement portion of the cover are provided from being lowered by providing the attachment portion and the engagement portion that are likely to be stressed close to each other.

  As a result, it is possible to provide a centrifugal fan that can reduce the outer size of the centrifugal fan while ensuring an appropriate mechanical strength of the casing.

  According to the invention described in claim 2, since the cover has a part of the side wall of the casing, the mechanical strength of the cover is improved.

  According to the third aspect of the present invention, the attachment portion can be provided also for the cover having the air inlet.

  According to the invention described in claim 4, since the cover and the plurality of attachment portions are formed as a single resin member continuous by injection molding, the cover provided with the attachment portions can be mass-produced at low cost, and the centrifugal The manufacturing cost of the fan can be reduced.

  According to the fifth aspect of the present invention, since the weld is formed avoiding the portion of the resin member where the mounting portion that is likely to be loaded is formed, the mechanical strength of the portion of the resin member where the mounting portion is formed is increased. It can be secured.

  According to the sixth aspect of the present invention, since the weld is formed avoiding the portion of the resin member where the locking portion that is likely to be loaded is formed, the mechanical portion of the portion of the resin member where the locking portion is formed is formed. Strength can be secured.

  According to the seventh aspect of the present invention, the first and second locking portions provided on the cover are engaged with the locked portions provided on the side wall portion of the casing body from both the inside and outside in the radial direction. A high fixing strength between the cover and the casing body can be obtained.

  According to the eighth aspect of the present invention, the centrifugal fan is fixed by engaging the mounting portion of the centrifugal fan with a predetermined position of the member to be mounted. Therefore, a special fixture such as a bolt is attached to the centrifugal fan. No need for a screwdriver when installing.

  According to the ninth aspect of the invention, since the centrifugal fan can be attached simply by engaging the hook portion of the attachment portion with the member to be attached, the centrifugal fan can be easily attached.

  Moreover, since the through hole is provided in the portion of the cover that overlaps the hook portion when viewed from the central axis direction, the cover can be easily manufactured by injection molding using a mold having a simple structure.

  Further, a locking portion for fixing the cover to the casing body is provided so as to avoid a portion where the distance from each mounting portion on the outer side surface of the cover is the shortest. Therefore, by providing the locking portion at a position close to the through hole of the mounting portion, it is possible to prevent the mechanical strength of the portion where the cover mounting portion and the locking portion are provided from being lowered.

  According to the invention described in claim 10, since the plurality of mounting portions for mounting the centrifugal fan to the member to be mounted are provided on the surface facing the lower side in the central axis direction of the base portion of the casing body, Unlike the technology, it is not necessary to form a mounting hole for inserting a bolt outside the air flow path in the centrifugal fan.

  Further, the locking portion for fixing the casing body to the cover is provided so as to avoid a portion where the distance from each mounting portion on the outer surface of the base portion is the shortest. Therefore, it is possible to prevent the mechanical strength of the portion where the mounting portion and the locking portion of the base portion are provided from being lowered by providing the mounting portion and the locking portion that are likely to be stressed close to each other. In particular, in the configuration in which the attachment portion is formed on the base portion, the attachment is performed by applying a force to the cover having the side wall portion. A large load is generated in the locked portion provided in the portion. In this regard, in the configuration according to the present invention, since the locking portion is provided avoiding the portion where the distance to each mounting portion on the outer surface of the base portion is the shortest, the mounting portion and the locking portion of the base portion It is possible to ensure the mechanical strength of the portion where the is provided.

  As a result, it is possible to provide a centrifugal fan that can reduce the outer size of the centrifugal fan while ensuring an appropriate mechanical strength of the casing.

  According to the eleventh aspect of the present invention, the attachment portion can be provided also to the base portion of the casing body having the air inlet.

  According to the invention described in claim 12, since the base portion of the casing body and the plurality of mounting portions are formed as a single resin member continuous by injection molding, the base portion provided with the mounting portion is inexpensive. Can be mass-produced, and the manufacturing cost of the centrifugal fan can be reduced.

  According to the thirteenth aspect of the invention, since the weld is formed avoiding the portion of the resin member where the mounting portion where the load is likely to be applied is formed, the mechanical strength of the portion of the resin member where the mounting portion is formed is increased. It can be secured.

  According to the fourteenth aspect of the present invention, since the weld is formed avoiding the portion of the resin member where the locking portion that is likely to be loaded is formed, the mechanical portion of the portion of the resin member where the locking portion is formed is formed. Strength can be secured.

  According to the fifteenth aspect of the present invention, the first and second locking portions provided on the base portion of the casing main body are engaged with the locked portions provided on the side wall portion of the cover from both the inside and outside in the radial direction. Therefore, a high fixing strength between the cover and the casing body can be obtained.

  According to the sixteenth aspect of the present invention, the centrifugal fan is fixed by engaging the centrifugal fan mounting portion with the predetermined position of the member to be mounted. No need for a screwdriver when installing.

  According to the invention described in claim 17, since the centrifugal fan can be attached only by engaging the hook portion of the attachment portion with the member to be attached, the centrifugal fan can be easily attached.

  In addition, since the through hole is provided in the portion of the base portion that overlaps with the hook portion when viewed from the central axis direction, it can be easily manufactured by injection molding using a mold having a simple structure.

  Further, the locking portion for fixing the casing body to the cover is provided so as to avoid a portion where the distance from each mounting portion on the outer surface of the base portion is the shortest. Therefore, by providing the locking portion at a position close to the through hole of the mounting portion, it is possible to prevent the mechanical strength of the portion of the base portion where the mounting portion and the locking portion are provided from being lowered.

  FIG. 1 is a sectional view of a centrifugal fan according to an embodiment of the present invention, FIGS. 2 and 3 are a perspective view and an exploded perspective view of the centrifugal fan, and FIG. 4 is an upper surface of a cover provided in the centrifugal fan. FIG.

  As illustrated in FIGS. 1 to 4, the centrifugal fan 10 includes an impeller 1, a motor unit 2, a casing 3, and a plurality of attachment units 4.

  The impeller 1 rotates around the central axis 5 to intake air in the direction of the central axis 5 and to exhaust outward in the radial direction. The impeller 1 includes a cup portion 11 that accommodates the motor portion 2, a plurality of moving blades 12 that are spaced radially outward from the cup portion 11, and a radially outward direction from the cup portion 11. And a support portion 13 that supports the plurality of moving blades 12. Then, when the moving blade 12 is rotated about the central axis 5, air sucked in the direction of the central axis 5 from an inlet 6 of the casing 3 described later is exhausted radially outward. The air exhausted radially outward by the moving blade 12 is sent out through an exhaust port 7 described later of the casing 3.

  The motor unit 2 includes a rotor magnet 21 attached to the inner peripheral surface of the cup unit 11 of the impeller 12 and an armature 22 that generates torque between the rotor magnet 21 and the impeller 1. Rotate. Such a motor part 2 is accommodated in the cup part 11 of the impeller 12.

  The casing 3 supports the motor unit 2 and has an intake port 6 formed on the upper side in the central axis 5 direction and an exhaust port 7 formed outward in the radial direction. The flow path of the air flow generated by the impeller 1 (Hereinafter referred to as “air channel”). Such a casing 3 includes a casing body 31 and a cover 32 formed as a separate member from the casing body 31.

  The casing body 31 includes a base portion 311 that supports the motor portion 2, and an exhaust port 7, and a side wall portion 312 that surrounds the impeller 1 from the outside in the radial direction. At the upper end of the side wall 312 to which the cover 32 is attached, at least one (for example, a plurality) first locked portions 313 and at least one (for example, a plurality) second locked portions 314 are provided. Is provided. In the present embodiment, for example, the first locked portion 313 is configured by a convex portion protruding from the outer surface of the side wall portion 312. Further, the second locked portion 314 is configured by a through hole (or a recess) that opens on the radially inner surface of the side wall portion 312. First and second locking portions 322 and 323 described later provided on the cover 32 are engaged with the first and second locked portions 313 and 314.

  The cover 32 has a surface 321 facing the upper side in the central axis 5 direction where the plurality of mounting portions 4 are provided, and faces the base portion 311 in the direction of the central axis 5 with the impeller 1 interposed therebetween, and the central axis 5 of the casing body 31. It is arranged on the upper side in the direction. At least one (for example, a plurality) of first locking portions 322 and at least one (for example, a plurality of) second locking portions 323 are provided on the outer surface of the cover 32 in the radial direction. . These first and second locking portions 322 and 323 engage the first and second locked portions 313 and 314, respectively, to fix the cover 32 to the casing body 31.

  The first locking portion 322 has a substantially L-shaped cross section along the radial direction. Then, as shown in FIG. 5, the portion 322 a bent downward in the direction of the central axis 5 of the first locking portion 322 has a radial direction on the first locked portion 313 of the casing body 31. Engage from outside. The second locking portion 323 has a projecting shape that protrudes from the outer surface in the radial direction of the cover 32, and the second locking portion 314 of the casing body 31 has a radial shape on the above-described second locked portion 314. Engage from the inside.

  A plurality of (for example, three) attachment portions 4 are members for attaching the centrifugal fan 10 to a housing (for example, an outer wall member of the housing) 8 that is a member to be attached. The centrifugal fan 10 is fixed by engaging with the locking hole 8a (predetermined part). The number of the locking holes 8 a of the housing 8 is the same as the number of the mounting portions 4 at a position facing the mounting portion 4 of the centrifugal fan 10. In addition, an air intake port 8 b is provided in a portion of the housing 8 that faces the intake port 6 of the centrifugal fan 10.

  As shown in FIG. 6, the mounting portion 4 has a support portion 41 that extends from the surface 321 of the cover 32 upward in the central axis 5 direction, and a circumferential direction around the central axis 5 from the tip of the support portion 41. And an extending hook portion 42. The hook portion 42 of each attachment portion 4 is oriented in the same direction with respect to the circumferential direction (for example, oriented so as to face counterclockwise when viewed from the upper side in the direction of the central axis 5). A through hole 324 is provided in a portion of the cover 32 that overlaps with the hook portion 42 when viewed from the direction of the central axis 5.

  The plurality of attachment portions 4 are provided at intervals in the circumferential direction around the central axis 5 along the outer peripheral portion of the air inlet 6 of the cover 32.

  When the centrifugal fan 10 is attached, the hook portion 42 of the attachment portion 4 is passed through the locking hole 8a of the housing 8, and the centrifugal fan 10 is rotated in the circumferential direction to which the hook portion 42 is directed. The hook portion 42 engages with the outer peripheral portion of the locking hole 8 a in the housing 8. Thereby, the centrifugal fan 10 is fixed to the housing 8. A buffer material or an elastic member (for example, a sheet-like sponge material) may be sandwiched between the centrifugal fan 10 and the housing 8.

  Further, in this embodiment, in order to ensure the mechanical strength of the cover 32, the distance between the first and second engaging portions 322 and 323 and each mounting portion 4 on the outer surface in the radial direction of the cover 32 is the shortest. The part 325 (refer FIG. 4) which becomes is provided. The portion 325 having the shortest distance from each mounting portion 4 is, for example, from the portion closest to the radially outer surface of the cover 32 of the through hole 324 provided along with the mounting portion 4 to the outside thereof. When the virtual line 60 is drawn so that the length of the line is the shortest toward the side surface, the virtual line 60 is a part that reaches the outer surface.

  Further, the cover 32 and the plurality of attachment portions 4 are formed as a single continuous resin member by injection molding. Injection molding in this case is performed using, for example, an upper mold and a lower mold that are released in the direction of the central axis 5.

  Moreover, in this embodiment, the weld which arises in a resin member with injection molding is formed in parts other than the attachment part 4, the 1st latching | locking part 322, and the 2nd latching | locking part 323 in a resin member. For example, when the resin is introduced into the mold from the direction indicated by the arrow 50 in FIG. 4 (the direction corresponding to the exhaust port 7), the resin introduced in the mold proceeds separately on both sides of the intake port 6, In the region 51 surrounded by the broken line in FIG.

  In addition, you may form the base part 311 and the side wall part 312 of the casing main body 31 as a single resin member by injection molding.

  As described above, according to the present embodiment, the plurality of attachment portions 4 for attaching the centrifugal fan 10 to the housing 8 are provided on the surface 321 facing the upper side in the central axis 5 direction of the cover 32 constituting the casing 3. Therefore, it is not necessary to form a bolt insertion hole on the outside of the air flow path in the centrifugal fan as in the prior art.

  Further, in order to fix the cover 32 to the casing body 31, the first and second locking portions 322 and 323 are provided so as to avoid the portion where the distance from each mounting portion 4 on the outer surface of the cover 32 is the shortest. Yes. Therefore, the mechanical strength of the portion of the cover 32 where the mounting portion 4 and the locking portions 322 and 323 are provided is increased by providing the mounting portion 4 and the locking portions 322 and 323 that are prone to stress. It can be prevented from lowering. In particular, when the locking portions 322 and 323 are provided at positions close to the through hole 324 of the mounting portion 4, the mechanical strength of the portion of the cover 32 where the mounting portion 4 and the locking portions 322 and 323 are provided is reduced. Can be prevented.

As a result, it is possible to provide the centrifugal fan 10 in which the outer size of the centrifugal fan 10 can be reduced while ensuring an appropriate mechanical strength of the casing 3. Since the centrifugal fan 10 is fixed by engaging with 8a, a special fixing tool such as a bolt is not required for the attachment of the centrifugal fan 10, and a driver or the like is not required for the attachment.

  Further, since the cover 32 and the plurality of attachment portions 4 are formed as a single resin member continuous by injection molding, the cover 32 provided with the attachment portions 4 can be mass-produced at low cost, and the manufacturing cost of the centrifugal fan 10 is reduced. Can be reduced. In particular, since the through hole 324 is provided in a portion of the cover 32 that overlaps the four hook portions 42 of the attachment portion when viewed from the direction of the central axis 5, the attachment portion 4 and the cover 32 can be connected to a mold having a simple structure. It can be easily produced by the injection molding used.

  In addition, since the weld is formed avoiding the portion where the mounting portion 4 and the locking portions 322 and 323 where the load is easily applied to the resin member constituting the cover 32 and the plurality of mounting portions 4 are formed, the mounting portion 4 and the engaging portion are formed. The mechanical strength of the portion of the resin member where the stop portions 322 and 323 are formed can be ensured.

  Further, the first and second locking portions 322 and 323 provided on the cover 32 have first and second locked portions 313 and 313 provided on the side wall portion 312 of the casing body 31 from both inside and outside in the radial direction. Since it engages with 314, a high fixing strength between the cover 32 and the casing body 31 is obtained.

  Below, the modification of the above-mentioned embodiment is described.

  As a first modification, a part of the side wall 312 provided on the casing body 31 may be provided on the cover 32 as a cover side wall. In this case, the cover side wall portion extends from the outer edge portion in the radial direction of the cover 32 toward the casing main body 31 and is combined with the side wall portion 312 of the casing main body 31 to constitute the side wall of the casing 3. In addition, the cover 32 and the cover side wall part are continuously formed by a single member.

  Thus, when a part of side wall of the casing 3 is provided in the cover 32, the mechanical strength of the cover 32 can be improved.

  As a second modification, the air inlet 6 may be provided in the base portion 311 of the casing body 31 without providing the air inlet 6 in the cover 32. Alternatively, the air inlet 6 may be provided in both the cover 32 and the base portion 311.

  As a third modification, the plurality of attachment portions 4 may be provided not on the cover 32 but on the surface of the base portion 311 of the casing body 31 facing the lower side in the central axis 5 direction. In this case, the through hole 324 is provided in a portion of the base portion 311 that overlaps the hook portion 42 of each attachment portion 4 when viewed from the direction of the central axis 5.

  In relation to this configuration, the side wall 312 of the casing body 31 may be provided on the cover 32 side. In this case, the casing body 31 is configured only by the base portion 311, and the first and second locking portions 322 and 323 described above are provided on the radially outer surface of the base portion 311. Correspondingly, the first and second locked portions 313 and 314 described above are provided at the lower end portion of the side wall portion 312 of the cover 32 in the direction of the central axis 5.

  Also in this configuration, the first and second locking portions 322 and 323 are provided avoiding the portion where the distance from each attachment portion 4 on the outer surface of the base portion 311 is the shortest. When the air inlet 6 is provided in the base portion 311, the plurality of attachment portions 4 are spaced in the circumferential direction around the central axis 5 along the outer peripheral portion of the air inlet 6 of the base portion 311. Provided.

  Further, when the base portion 311 and the plurality of attachment portions 4 are formed as a single resin member by injection molding, the weld generated by the injection molding is attached to the attachment portion 4 and the locking portions 322, It is formed in parts other than H.323.

  Even with the configuration according to the third modified example, substantially the same effect as that of the above-described embodiment can be obtained. In particular, in the configuration in which the attachment portion 4 is formed on the base portion 311 as in this modification, the attachment is performed by applying a force to the cover 32 having the side wall portion 312, and therefore the outer surface of the base portion 311 is attached at the time of attachment. A large load is generated on the locking portions 322 and 323 provided on the side wall and the locked portions 313 and 314 provided on the side wall portion 312 of the cover 32. In this regard, in the configuration according to this modification, the locking portions 322 and 323 are provided so as to avoid the portion where the distance from each mounting portion 4 on the outer surface of the base portion 311 is the shortest. The mechanical strength of the portion where the mounting portion 4 and the locking portions 322 and 323 are provided can be ensured.

It is sectional drawing of the centrifugal fan which concerns on one Embodiment of this invention. It is a perspective view of the centrifugal fan of FIG. It is a disassembled perspective view of the centrifugal fan of FIG. It is a top view of a cover. It is sectional drawing shown in the state which the 1st latching | locking part and the 1st to-be-latched part engaged. It is a perspective view of the attaching part provided in the cover of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Impeller, 2 Motor part, 3 Casing, 4 Mounting part, 5 Center axis, 6 Inlet, 7 Exhaust, 8 Housing, 8a Locking hole, 8b Intake, 10 Centrifugal fan, 11 Cup part, 12 Rotor blade , 13 Support part, 21 Rotor magnet, 22 Armature, 31 Casing body, 32 Cover, 41 Support part, 42 Hook part, 311 Base part, 312 Side wall part, 313 First locked part, 314 Second covered part Locking portion, 321 surface, 322 first locking portion, 323 second locking portion, 324 through-hole.

Claims (17)

A centrifugal fan,
An impeller that inhales in the direction of the central axis by rotating about the central axis and exhausts outward in the radial direction;
A motor unit for rotating the impeller;
A casing that supports the motor unit, has an intake port formed on the upper side in the central axis direction, has an exhaust port formed in the radial direction, and forms a flow path of an air flow generated by the impeller;
A plurality of attachment portions provided on a surface of the casing facing the upper side in the central axis direction, and attaching the centrifugal fan to a member to be attached;
With
The casing is
A casing body having a base portion that supports the motor portion, and a side wall portion that is formed with the exhaust port and surrounds the impeller from the radially outer side;
The casing body is formed as a separate member, has the surface on which the plurality of mounting portions are provided, and faces the base portion in the direction of the central axis across the impeller, and the central axis of the casing body A cover arranged on the upper side in the direction,
Consists of
The casing body has a locked portion formed at the upper end of the side wall portion,
The cover is provided on the radially outer side surface of the cover, and is formed with a locking portion that fixes the cover to the casing body by engaging with the locked portion.
The centrifugal fan according to claim 1, wherein the locking portion is provided so as to avoid a portion where the distance from each attachment portion on the outer side surface of the cover is the shortest. The centrifugal fan according to claim 1,
The cover includes a cover side wall extending from the radially outer edge toward the casing body, and the cover side wall is combined with the side wall to form a side wall of the casing. The centrifugal fan is characterized in that the cover and the cover side wall are continuously formed of a single member. The centrifugal fan according to claim 1 or 2,
The cover has the inlet;
The centrifugal fan, wherein the plurality of attachment portions are provided at intervals in a circumferential direction around the central axis along an outer peripheral portion of the intake port of the cover. The centrifugal fan according to any one of claims 1 to 3,
The centrifugal fan, wherein the cover and the plurality of attachment portions are formed as a single resin member continuous by injection molding. The centrifugal fan according to claim 4,
A centrifugal fan, wherein a weld generated by the injection molding is formed in a portion of the resin member other than the mounting portion. The centrifugal fan according to claim 4 or 5,
A centrifugal fan in which a weld generated by the injection molding is formed in a portion of the resin member other than the locking portion. The centrifugal fan according to any one of claims 1 to 6,
The locking portion is
A first locking portion that engages with the locked portion from the inside in the radial direction;
A second locking portion that engages from the radially outer side of the locked portion;
A centrifugal fan characterized by comprising: The centrifugal fan according to any one of claims 1 to 7,
The centrifugal fan is characterized in that the attachment portion fixes the centrifugal fan by engaging with a predetermined part of the attachment target member. The centrifugal fan according to any one of claims 1 to 8,
The mounting portion is
A support portion extending in the direction of the central axis from the surface of the cover;
A hook portion extending in a circumferential direction around the central axis from the tip of the support portion;
With
A centrifugal fan, wherein a through hole is provided in a portion of the cover that overlaps the hook portion when viewed from the central axis direction. A centrifugal fan,
An impeller that inhales in the direction of the central axis by rotating about the central axis and exhausts outward in the radial direction;
A motor unit for rotating the impeller;
A casing that supports the motor unit, has an intake port formed on the upper side in the central axis direction, has an exhaust port formed in the radial direction, and forms a flow path of an air flow generated by the impeller;
A plurality of attachment portions provided on a surface of the casing facing the lower side in the central axis direction, for attaching the centrifugal fan to a member to be attached;
With
The casing is
A base portion supporting the motor portion and having the surface provided with the plurality of attachment portions;
The casing body is formed as a separate member, the exhaust port is formed, has a side wall portion that surrounds the impeller from the outside in the radial direction, and the base portion and the central shaft across the impeller A cover that faces the direction and is arranged on the upper side in the central axis direction of the base part,
Consists of
The cover has a locked portion formed at the lower end of the side wall portion,
The base portion is
Provided on the radially outer side surface of the base portion, a locking portion for fixing the base portion to the cover by engaging with the locked portion is formed,
The centrifugal fan according to claim 1, wherein the locking portion is provided so as to avoid a portion where the distance from each mounting portion on the outer side surface of the base portion is the shortest. The centrifugal fan according to claim 10,
The base portion has the intake port,
The centrifugal fan, wherein the plurality of attachment portions are provided at intervals in a circumferential direction around the central axis along an outer peripheral portion of the intake port of the base portion. The centrifugal fan according to claim 10 or 11,
The centrifugal fan, wherein the base portion and the plurality of attachment portions are formed as a single resin member continuous by injection molding. The centrifugal fan according to claim 12,
A centrifugal fan, wherein a weld generated by the injection molding is formed in a portion of the resin member other than the mounting portion. The centrifugal fan according to claim 12 or 13,
A centrifugal fan in which a weld generated by the injection molding is formed in a portion of the resin member other than the locking portion. The centrifugal fan according to any one of claims 10 to 14,
The locking portion is
A first locking portion that engages with the locked portion from the inside in the radial direction;
A second locking portion that engages with the locked portion from the outside in the radial direction;
A centrifugal fan characterized by comprising: The centrifugal fan according to any one of claims 10 to 15,
The centrifugal fan is characterized in that the attachment portion fixes the centrifugal fan by engaging with a predetermined part of the attachment target member. The centrifugal fan according to any one of claims 10 to 16,
The mounting portion is
A support portion extending in the central axis direction from the surface of the base portion;
A hook portion extending in a circumferential direction around the central axis from the tip of the support portion;
With
A centrifugal fan, wherein a through hole is provided in a portion of the base portion that overlaps with the hook portion when viewed from the central axis direction.

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